JSFiddle - React, Tailwind, and code Playground

HTML

<span class="not-h1">Hello</span>
<span class="is-h1">Hello</span>

CSS

.is-h1 { 
    display: block;
    font-size: 2em;
    margin-top: 0.67em;
    margin-bottom: 0.67em;
    margin-left: 0;
    margin-right: 0;
    font-weight: bold;
}